//////////////////////////////////////////////////////////////////////////////
//
// Copyright(C) < 1998 - 2024 > Glodon Company Limited
//
// Licensed under the MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//////////////////////////////////////////////////////////////////////////////

using System.Collections.ObjectModel;
using System.IO;
using System.Reflection;

#if Gdmp || Gnuf
using Glodon.Gdmp.DB;
using Glodon.Gdmp.UI;
#elif Gap
using Glodon.Gap.DB;
using Glodon.Gap.UI;
#endif
using Glodon.Lookup.Lookup.Core;
using Glodon.Lookup.Utils;

namespace Glodon.Lookup.Commands
{
    public abstract class CommandBase : IExternalCommand
    {
        protected abstract void Execute();
        public Result Execute(UIDocument document)
        {
            if (document == null)
            {
                ExceptionUtils.ShowExceptionMessage("请先打开或新建一个文档");
                return Result.Succeeded;
            }
            InitailizeAsync().Wait();
            Execute();
            AppDomain.CurrentDomain.AssemblyResolve -= CurrentDomainAssemblyResolve;
            return Result.Succeeded;
        }

        protected async Task InitailizeAsync()
        {
            //备用，屏蔽不Show的类别。
            GlodonAPI.CategoriesCannotShow = new ReadOnlyCollection<UniIdentity>(new List<UniIdentity>() { });

            AppDomain.CurrentDomain.AssemblyResolve += CurrentDomainAssemblyResolve;
            AppDomain.CurrentDomain.UnhandledException += (sender, e) =>
            {
                Exception ex = (Exception)e.ExceptionObject;
                ExceptionUtils.ShowExceptionMessage(ex);
            };
            TaskScheduler.UnobservedTaskException += HandleUnobservedTaskException;

            //依赖注入。
            await Host.StartHost();
        }
        static void HandleUnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs e)
        {
            // 处理异常
            foreach (Exception ex in e.Exception.InnerExceptions)
            {
                ExceptionUtils.ShowExceptionMessage(ex);
            }
            // 通知垃圾回收器，这个异常已经被处理
            e.SetObserved();
        }

        #region 解决System.Runtime.CompilerServices.Unsafe.dll加载问题
        private const string MYPROBINGFOLDER = "ProbingFolder";
        private Assembly CurrentDomainAssemblyResolve(object sender, ResolveEventArgs args)
        {
            var assyName = new AssemblyName(args.Name);

            var newPath = Path.Combine(MYPROBINGFOLDER, assyName.Name);
            if (!newPath.EndsWith(".dll"))
            {
                var location = Assembly.GetAssembly(GetType()).Location;
                var assemblyFolder = Path.GetDirectoryName(location);
                newPath = Path.Combine(assemblyFolder, newPath + ".dll");
            }
            if (File.Exists(newPath))
            {
                var assy = Assembly.LoadFile(newPath);
                return assy;
            }
            return null;
        }
        #endregion
    }
}
